#!/usr/bin/env python3
#
# Communicate with a JBD/SZLLT BMS and return basic information
# in order to shutdown equipment when voltage levels drop or remaining
# capacity gets low
# TODO: get individual cell voltage
# TODO: scripts to shutdown NAS when voltage goes below 13.xV or
#       percent_capacity goes below 25%
#
import argparse
import json
import pprint
import serial
import serial.rs485
import signal
import sys
import time
try:
    import prometheus_client
    can_export_prometheus = True
except:
    can_export_prometheus = False


PROMETHEUS_UPDATE_PERIOD = 30
SERIALPORT = "/dev/ttyUSB0"
#SERIALPORT = "/dev/rfcomm1"
BAUDRATE = 9600

# usb 1-1.4: new full-speed USB device number 4 using xhci_hcd
# usb 1-1.4: New USB device found, idVendor=0403, idProduct=6001, bcdDevice= 6.00
# usb 1-1.4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
# usb 1-1.4: Product: FT232R USB UART
# usb 1-1.4: Manufacturer: FTDI
# usb 1-1.4: SerialNumber: AQ00QFHZ
# usbcore: registered new interface driver usbserial_generic
# usbserial: USB Serial support registered for generic
# usbcore: registered new interface driver ftdi_sio
# usbserial: USB Serial support registered for FTDI USB Serial Device
# ftdi_sio 1-1.4:1.0: FTDI USB Serial Device converter detected
# usb 1-1.4: Detected FT232RL
# usb 1-1.4: FTDI USB Serial Device converter now attached to ttyUSB0
# usb 1-1.4: usbfs: interface 0 claimed by ftdi_sio while 'python3' sets config #1

# TODO: ensure ttyUSB0 points to  idVendor=0403, idProduct=6001
# with serial.tools.list_ports.ListPortInfo
# python3 -m serial.tools.list_ports USB
ser = serial.Serial(SERIALPORT, BAUDRATE)
ser.parity = serial.PARITY_NONE     # set parity check: no parity
ser.bytesize = serial.EIGHTBITS     # number of bits per bytes
ser.stopbits = serial.STOPBITS_ONE  # number of stop bits

ser.timeout = 1         # timeout block read
ser.writeTimeout = 1    # timeout for write

def cleanup(ser, debug):
    if debug > 2:
        print("Cleaning up...")
    if ser.is_open:
        ser.reset_input_buffer()  # flush input buffer, discarding all its contents
        ser.reset_output_buffer() # flush output buffer, aborting current output
        ser.close()

def calculate_checksum(msg):
    checksum = ''
    return checksum

def verify_checksum(data, checksum):
    # (data + length + command code) checksum, then complement, then add 1, high bit first, low bit last
    # data should have start/rw stripped
    s = 0
    for i in data:
        s += i
    s = (s ^ 0xFFFF) + 1
    chk = bytes_to_digits(checksum[0], checksum[1])
    return s == chk

def convert_to_signed(x):
    # For values below 1024, these seem to be actual results
    # For values above 1024, these seem to be encoded to account for high and negative floats
    max_uint = 1024
    if x >= max_uint:
        return (x - 2**9) % 2**10 - 2**9
    else:
        return x

def bytes_to_digits(high, low):
    result = high
    result <<= 8
    result = result | low
    return result

def bytes_to_date(high, low):
    result= bytes_to_digits(high, low)
    day  = result & 0x1f
    mon  = (result >> 5) & 0x0f
    year = 2000 + (result >> 9)
    return "{:04d}-{:02d}-{:02d}".format(year, mon, day)

# takes a serial object and a message, returns a response
def requestMessage(ser, reqmsg, debug):
    if debug > 2:
        print('Starting Up Serial Monitor')
    if ser.is_open:
        ser.close()

    try:
        ser.open()
    except Exception as e:
        print("error open serial port: {0}".format(str(e)))
        return False

    if ser.is_open:
        try:
            # Resetting once alone doesn't seem to do the trick when  we discarded data
            # on a previous run
            for i in range(2):
                ser.reset_input_buffer()  # flush input buffer, discarding all its contents
                ser.reset_output_buffer() # flush output buffer, aborting current output
            if debug > 0:
                print("Write data: {0}".format("".join('0x{:02x} '.format(x) for x in reqmsg)))
            w = ser.write(reqmsg)
            if debug > 2:
                print("Bytes written: {0}".format(w))
            #time.sleep(1)
            if w != len(reqmsg):
                print("ERROR: {0} bytes written, {1} expected.".format(w, len(reqmsg)))
                return False
            wait_time = 0
            while ser.in_waiting == 0:
                # Return an empty string if we end up waiting too long
                if wait_time > 2:
                    cleanup(ser, debug)
                    return ''
                if debug > 2:
                    print("Waiting for data...")
                time.sleep(0.5)
                wait_time += 1
            if debug > 1:
                print("Awaiting reading: {0}".format(ser.in_waiting))
            response = ser.read_until(b'\x77')
            # Return an empty string if the read timed out or returned nothing
            if len(response) == 0:
                return ''
            if debug > 0:
                print("Read data: {0}".format(response.hex()))
            cleanup(ser, debug)
            return response
        except Exception as e:
            print("error communicating...: {0}".function(str(e)))
    else:
        print("cannot open serial port")

def parse_03_response(response):
    data = dict()
    # Response is 34 bytes:
    # 00        begin:  \xDD
    # 01        r/w:    \xA5
    # 02        status: \x00 = correct; \x80 = incorrect
    # 03        length (usually 27)
    # 04        data (size of length)
    # ...
    # length+4  checksum
    # length+5  checksum
    # length+6  end      \x77
    if bytes([response[0]]) != b'\xdd':
        print("ERROR: first byte not found: {0}".format(response[0]))
        return False

    if bytes([response[2]]) == b'\x80':
        print("ERROR: error byte returned from BMS: {0}".format(response[2]))
        return False

    data_len = response[3]
    if debug > 2:
        print("Data length (trimming 4 bytes): {0}".format(data_len))

    # The checksum is two bytes, offset by data_len + 4
    # Five bytes at the front of data
    # begin; rw; status, command; length
    # The checksum should check command, length, and data: [3] to [3+data_len+1]
    first  = data_len + 4
    second = data_len + 5
    if second > len(response):
        print("ERROR: primary response checksum not found")
        return False;
    checksum = bytes([response[first], response[second]])
    if not verify_checksum(response[3:first], checksum):
        print("ERROR: failed to validate received checksum")
        return False

    if data_len > 0:
        vtot = bytes_to_digits(response[4], response[5]) * 0.01
        data['bms_voltage_total_volts'] = dict()
        data['bms_voltage_total_volts']['help']  = "Total Voltage"
        data['bms_voltage_total_volts']['value'] = "{:.2f}".format(vtot)
        data['bms_voltage_total_volts']['units'] = "V"
        #data["Total Voltage"] = "{:.2f}V".format(vtot)
        if debug > 1:
            print("Total voltage: {:.2f}V".format(vtot))

        current = bytes_to_digits(response[6], response[7])
        current = convert_to_signed(current) * 0.01
        data["bms_current_amps"] = dict()
        data["bms_current_amps"]['help']  = "Current"
        data["bms_current_amps"]['value'] = "{:.2f}".format(current)
        data["bms_current_amps"]['units'] = "A"
        #data["Current"] = "{:.2f}A".format(current)
        if debug > 1:
            print("Current: {:.2f}A".format(current))

        res_cap = bytes_to_digits(response[8], response[9]) * 0.01
        nom_cap = bytes_to_digits(response[10], response[11]) * 0.01
        data['bms_capacity_remaining_ah'] = dict()
        data['bms_capacity_remaining_ah']['help']  = "Remaining Capacity"
        data['bms_capacity_remaining_ah']['value'] = "{:.2f}".format(res_cap)
        data['bms_capacity_remaining_ah']['units'] = "Ah"
        data['bms_capacity_nominal_ah'] = dict()
        data['bms_capacity_nominal_ah']['help']  = "Nominal Capacity"
        data['bms_capacity_nominal_ah']['value'] = "{:.2f}".format(nom_cap)
        data['bms_capacity_nominal_ah']['units'] = "Ah"
        #data["Remaining Capacity"] = "{:.2f}Ah".format(res_cap)
        #data["Nominal Capacity"] = "{:.2f}Ah".format(nom_cap)
        if debug > 1:
            print("Remaining capacity: {:.2f}Ah".format(res_cap))
            print("Nominal capacity: {:.2f}Ah".format(nom_cap))

        cycle_times = bytes_to_digits(response[12], response[13])
        data['bms_charge_cycles'] = dict()
        data['bms_charge_cycles']['help']  = "Charge Cycles"
        data['bms_charge_cycles']['value'] = "{0}".format(cycle_times)
        #data["Charge Cycles"] = "{0}".format(cycle_times)
        if debug > 1:
            print("Cycle times: {0}".format(cycle_times))

        man_date = bytes_to_date(response[14], response[15])
        data['bms_manufacture_date'] = dict()
        data['bms_manufacture_date']['help'] = "Date of Manufacture"
        data['bms_manufacture_date']['info'] = "{0}".format(man_date)
        #data["Date of Manufacture"] = "{0}".format(man_date)
        if debug > 1:
            print("Manufacturing date: {0}".format(man_date))

        cells = response[25] # 4S
        data['bms_cell_number'] = dict()
        data['bms_cell_number']['help']  = "Cells"
        data['bms_cell_number']['value'] = "{0}".format(cells)
        #data["Cells"] = "{0}".format(cells)
        if debug > 1:
            print("Cells: {0}S".format(cells))

        balance_state_high = bytes_to_digits(response[16], response[17]) # 1S  to 16S
        balance_state_low  = bytes_to_digits(response[18], response[19]) # 17S to 32S
        # 1 bit per 4S (2 bytes = 16S); in 4S, we should expect:
        # 0x0 (no cells balancing)               0
        # 0x1 (cell 1 balancing)                 1
        # 0x2 (cell 2 balancing)                 2
        # 0x3 (cells 1 + 2 balancing)            3
        # 0x4 (cell 3 balancing)                 4
        # 0x5 (cells 1 + 3 balancing)            5
        # 0x6 (cells 2 + 3 balancing)            6
        # 0x7 (cells 1 + 2 + 3 balancing)        7
        # 0x8 (cell 4 balancing)                 8
        # 0x9 (cells 1 + 4 balancing)            9
        # 0xA (cells 2 + 4 balancing)           10
        # 0xB (cells 1 + 2 + 4 balancing)       11
        # 0xC (cells 3 + 4 balancing)           12
        # 0xD (cells 1 + 3 + 4 balancing)       13
        # 0xE (cells 2 + 3 + 4 balancing)       14
        # 0xF (cells 1 + 2 + 3 + 4 balancing)   15
        #data["Balancing"] = dict()
        data['bms_cells_balancing'] = dict()
        data['bms_cells_balancing']['help']   = "Cells balancing"
        data['bms_cells_balancing']['label']  = 'cell'
        data['bms_cells_balancing']['values'] = dict()
        for cell in range(cells):
            # Cells from 1 to 16 are recorded in balance_state_low,
            # and from 17 to 32 in balance_state_high; hilo_cell records the offset
            # relative to the state group
            if cell >= 16:
                state = balance_state_high
                hilo_cell = cell - 16
            else:
                state = balance_state_low
                hilo_cell = cell
            # Cells are recorded as groups of 4 bits (0x0-0xF) per 4 cells
            g = int(hilo_cell / 4) 
            b = 2**(hilo_cell - (g * 4 ))
            data['bms_cells_balancing']['values'][cell+1] = "{0}".format(int(bool((state >> g) & b)))
            #data["Balancing"][cell+1] = "{0}".format(bool((state >> g) & b))
            if debug > 1:
                print("Balancing cell {0}: {1}".format(cell, bool((state >> g & b))))
                            
        protection_state = bytes_to_digits(response[20], response[21])
        sop  = protection_state & 1
        sup  = protection_state & 2
        gop  = protection_state & 4
        gup  = protection_state & 8
        cotp = protection_state & 16
        cutp = protection_state & 32
        dotp = protection_state & 64
        dutp = protection_state & 128
        cocp = protection_state & 256
        docp = protection_state & 512
        scp  = protection_state & 1024
        fdic = protection_state & 2048
        slm  = protection_state & 4096
        data['bms_protection_sop_bool'] = dict()
        data['bms_protection_sop_bool']['help'] = "Single overvoltage protection"
        data['bms_protection_sop_bool']['value'] ="{0}".format(int(bool(sop)))
        data['bms_protection_sup_bool'] = dict()
        data['bms_protection_sup_bool']['help']  = "Single undervoltage protection"
        data['bms_protection_sup_bool']['value'] ="{0}".format(int(bool(sup)))
        data['bms_protection_wgop_bool'] = dict()
        data['bms_protection_wgop_bool']['help']  = "Whole group overvoltage protection"
        data['bms_protection_wgop_bool']['value'] ="{0}".format(int(bool(gop)))
        data['bms_protection_wgup_bool'] = dict()
        data['bms_protection_wgup_bool']['help']  = "Whole group undervoltage protection"
        data['bms_protection_wgup_bool']['value'] ="{0}".format(int(bool(gup)))
        data['bms_protection_cotp_bool'] = dict()
        data['bms_protection_cotp_bool']['help']  = "Charging over-temperature protection"
        data['bms_protection_cotp_bool']['value'] ="{0}".format(int(bool(cotp)))
        data['bms_protection_cutp_bool'] = dict()
        data['bms_protection_cutp_bool']['help']  = "Charging under-temperature protection"
        data['bms_protection_cutp_bool']['value'] ="{0}".format(int(bool(cutp)))
        data['bms_protection_dotp_bool'] = dict()
        data['bms_protection_dotp_bool']['help']  = "Discharging over-temperature protection"
        data['bms_protection_dotp_bool']['value'] ="{0}".format(int(bool(dotp)))
        data['bms_protection_dutp_bool'] = dict()
        data['bms_protection_dutp_bool']['help']  = "Discharging under-protection"
        data['bms_protection_dutp_bool']['value'] ="{0}".format(int(bool(dutp)))
        data['bms_protection_cocp_bool'] = dict()
        data['bms_protection_cocp_bool']['help']  = "Charging over-current protection"
        data['bms_protection_cocp_bool']['value'] ="{0}".format(int(bool(cocp)))
        data['bms_protection_docp_bool'] = dict()
        data['bms_protection_docp_bool']['help']  = "Discharging over-current protection"
        data['bms_protection_docp_bool']['value'] ="{0}".format(int(bool(docp)))
        data['bms_protection_scp_bool'] = dict()
        data['bms_protection_scp_bool']['help']  = "Short-circuit protection"
        data['bms_protection_scp_bool']['value'] ="{0}".format(int(bool(scp)))
        data['bms_protection_fdic_bool'] = dict()
        data['bms_protection_fdic_bool']['help']  = "Front detection IC error"
        data['bms_protection_fdic_bool']['value'] ="{0}".format(int(bool(fdic)))
        data['bms_protection_slmos_bool'] = dict()
        data['bms_protection_slmos_bool']['help']  = "Software lock MOS"
        data['bms_protection_slmos_bool']['value'] ="{0}".format(int(bool(slm)))
        #data["Single overvoltage protection"] = "{0}".format(bool(sop))
        #data["Single undervoltage protection"] = "{0}".format(bool(sup))
        #data["Whole group overvoltage protection"] = "{0}".format(bool(gop))
        #data["Whole group undervoltage protection"] = "{0}".format(bool(gup))
        #data["Charging over-temperature protection"] = "{0}".format(bool(cotp))
        #data["Charging under-temperature protection"] = "{0}".format(bool(cutp))
        #data["Discharging over-temperature protection"] = "{0}".format(bool(dotp))
        #data["Discharging under-protection"] = "{0}".format(bool(dutp))
        #data["Charging over-current protection"] = "{0}".format(bool(cocp))
        #data["Discharging over-current protection"] = "{0}".format(bool(docp))
        #data["Short-circuit protection"] = "{0}".format(bool(scp))
        #data["Front detection IC error"] = "{0}".format(bool(fdic))
        #data["Software lock MOS"] = "{0}".format(bool(slm))
        if debug > 2:
            print("Protection state: {0}".format(protection_state))
            print("Single overvoltage protection: {0}".format(bool(sop)))
            print("Single undervoltage protection: {0}".format(bool(sup)))
            print("Whole group overvoltage protection: {0}".format(bool(gop)))
            print("Whole group undervoltage protection: {0}".format(bool(gup)))
            print("Charging over-temperature protection: {0}".format(bool(cotp)))
            print("Charging under-temperature protection: {0}".format(bool(cutp)))
            print("Discharging over-temperature protection: {0}".format(bool(dotp)))
            print("Discharging under-protection: {0}".format(bool(dutp)))
            print("Charging over-current protection: {0}".format(bool(cocp)))
            print("Discharging over-current protection: {0}".format(bool(docp)))
            print("Short-circuit protection: {0}".format(bool(scp)))
            print("Front detection IC error: {0}".format(bool(fdic)))
            print("Software lock MOS: {0}".format(bool(slm)))

        software_version = bytes([response[22]])

        # percent of capacity remaining, converted to a per mille ratio between 0 and 1
        rsoc = response[23] * 0.01
        data['bms_capacity_charge_ratio'] = dict()
        data['bms_capacity_charge_ratio']['help']  = "Percent Charge"
        data['bms_capacity_charge_ratio']['value'] = "{0}".format(rsoc)
        data['bms_capacity_charge_ratio']['units'] = "\u2030"
        #data["Percent Charge"] = "{0}".format(rsoc)
        if debug > 1:
            print("Capacity remaining: {0}%".format(rsoc * 100))

        # bit0 = charging; bit1 = discharging; 0 = MOS closing; 1 = MOS opening
        control_status = response[24]
        data['bms_charge_is_charging'] = dict()
        data['bms_charge_is_charging']['help']  = "MOSFET charging"
        data['bms_charge_is_charging']['value'] = int(bool(control_status & 1))
        data['bms_charge_is_discharging'] = dict()
        data['bms_charge_is_discharging']['help']  = "MOSFET discharging"
        data['bms_charge_is_discharging']['value'] = int(bool(control_status & 1))
        #data["Charging"] = bool(control_status & 1)
        #data["Discharging"] = bool((control_status >> 1) & 1)
        if debug > 1:
            if (control_status & 1):
                print("MOSFET charging: yes")
            else:
                print("MOSFET charging: no")
            if ((control_status >> 1) & 1):
                print("MOSFET discharging: yes")
            else:
                print("MOSFET discharging: no")

        ntc_num      = response[26] # number of temperature sensors
        ntc_content  = bytearray() # 2 * ntc_num in size
        temperatures = list()
        for i in range(ntc_num):
            temperatures.append((bytes_to_digits(response[27+(2*i)], response[28+(2*i)]) - 2731) * 0.1)
        data['bms_temperature_sensor_num'] = dict()
        data['bms_temperature_sensor_num']['help']  = "Temperature Sensors"
        data['bms_temperature_sensor_num']['value'] =  ntc_num
        #data["Temperature Sensors"] = ntc_num
        #data["Temperature"] = dict()
        data['bms_temperature_celcius'] = dict()
        data['bms_temperature_celcius']['help']   = "Temperature"
        data['bms_temperature_celcius']['units']  = "\u00B0C"
        data['bms_temperature_celcius']['label']  = 'sensor'
        data['bms_temperature_celcius']['values'] = dict()
        for i, temp in enumerate(temperatures):
            data['bms_temperature_celcius']['values'][i+1] = "{:.2f}".format(temp)
            #data["Temperature"][i+1] = "{:.2f}\u00B0C".format(temp)
        if debug > 1:
            print("Number of temperature sensors: {0}".format(ntc_num))
            for i, temp in enumerate(temperatures):
                print(u"Temperature sensor {:d}: {:.2f}\u00B0C".format(i+1, temp))

        return data

def parse_04_response(response):
    data = dict()
    # Response is 7 + cells * 2 bytes:
    # 00        begin:  \xDD
    # 01        r/w:    \xA5
    # 02        status: \x00 = correct; \x80 = incorrect
    # 03        length (usually 8)
    # 04        data (size of length)
    # ...
    # length+4  checksum
    # length+5  checksum
    # length+6  end      \x77
    if bytes([response[0]]) != b'\xdd':
        print("ERROR: first byte not found: {0}".format(response[0]))
        return False

    if bytes([response[2]]) == b'\x80':
        print("ERROR: error byte returned from BMS: {0}".format(response[2]))
        return False

    data_len = response[3]
    if debug > 2:
        print("Data length (trimming 4 bytes): {0}".format(data_len))

    # The checksum is two bytes, offset by data_len + 4
    # Five bytes at the front of data
    # begin; rw; status, command; length
    # The checksum should check command, length, and data: [3] to [3+data_len+1]
    first  = data_len + 4
    second = data_len + 5
    if second > len(response):
        print("ERROR: cell voltage checksum not found")
        return False
    checksum = bytes([response[first], response[second]])
    if not verify_checksum(response[3:first], checksum):
        print("ERROR: failed to validate received checksum")
        return False

    if data_len > 0:
        #data["Cell Voltages"] = dict()
        data['bms_voltage_cells_volts'] = dict()
        data['bms_voltage_cells_volts']['help']   = "Cell Voltages"
        data['bms_voltage_cells_volts']['units']  = "V"
        data['bms_voltage_cells_volts']['label']  = "cell"
        data['bms_voltage_cells_volts']['values'] = dict()
        for cell in range(int(data_len / 2)):
            first  = (cell * 2) + 4
            second = (cell * 2) + 5
            cellv = bytes_to_digits(response[first], response[second]) * 0.001
            data['bms_voltage_cells_volts']['values'][cell+1]  = "{:.3f}".format(cellv)
            #data["Cell Voltages"][i+1] = "{:.3f}V".format(cellv)
            if debug > 1:
                print("Cell {:.0f}: {:.3f}V".format(cell+1, cellv))
    return data

def collect_data(ser, debug):
    # Request is 7 bytes:
    # \xDD for start
    # \xA5 for read, \x5A for write
    # \x03 for regular info; \x04 for individual voltages
    # \x77 ends
    data = dict()
    reqmsg = bytearray([ 0xDD, 0xA5, 0x03, 0x00, 0xFF, 0xFD, 0x77 ])
    response_03 = requestMessage(ser, reqmsg, debug)

    if len(response_03) == 0:
        if debug > 0:
            print("Error retrieving BMS info. Trying again...")
        return False
    response_03 = bytearray(response_03)

    reqmsg = bytearray([ 0xDD, 0xA5, 0x04, 0x00, 0xFF, 0xFC, 0x77 ])
    response_04 = requestMessage(ser, reqmsg, debug)

    if len(response_04) == 0:
        if debug > 0:
            print("Error retrieving BMS info. Trying again...")
        return False
    response_04 = bytearray(response_04)

    parsed_03 = parse_03_response(response_03)
    if parsed_03 is not False:
        data.update(parsed_03)
    else:
        return False

    parsed_04 = parse_04_response(response_04)
    if parsed_04 is not False:
        data.update(parsed_04)
    else:
        return False

    return data


def main(ser, debug):
    data = dict()
    while bool(data) is False:
        data = collect_data(ser, debug)
        time.sleep(1)

    if args.report_json:
        print(json.dumps(data))

    elif args.report_print:
        pp = pprint.PrettyPrinter(indent=4)
        pp.pprint(data)


def prometheus_export(ser, debug, daemonize=True, filename=False):
    if not can_export_prometheus:
        return

    data = dict()
    # Initialize data structure, to fill in help values
    while bool(data) is False:
        data = collect_data(ser, debug)
        time.sleep(1)

    registry = prometheus_client.CollectorRegistry(auto_describe=True)
    # Set up the metric data structure for Prometheus
    metric = prometheus_create_metric(registry, data)
    # Populate the metric data structure this period
    prometheus_populate_metric(metric, data)

    if (daemonize):
        prometheus_client.start_http_server(9999, registry=registry)

        while True:
            # Delay, collect new data, and start again
            time.sleep(PROMETHEUS_UPDATE_PERIOD)
            # Reset data, so it is re-populated correctly
            data = dict()
            while bool(data) is False:
                data = collect_data(ser, debug)
            time.sleep(1)
            prometheus_populate_metric(metric, data)
            prometheus_client.generate_latest(registry)
    else:
        if not filename:
            print("Invalid filename supplied");
            return False     
        prometheus_client.write_to_textfile(filename, registry=registry)
        return True
  
def prometheus_create_metric(registry, data):
    metric = dict()
    for name, contains in data.items():
        helpmsg = ''
        if contains.get('help'):
            helpmsg = contains.get('help')
            if contains.get('units'):
                helpmsg += ' (' + contains.get('units') + ')'
        if contains.get('value'):
            metric[name] = prometheus_client.Gauge(name, helpmsg, registry=registry)
        # Has multiple values, each a different label
        elif contains.get('values'):
            if contains.get('label') is None:
                print("ERROR: no label for {0} specified".format(name))
            label = contains.get('label')
            metric[name] = prometheus_client.Gauge(name, helpmsg, [label], registry=registry)
        elif contains.get('info'):
            metric[name] = prometheus_client.Info(name, helpmsg, registry=registry)
        else:
            pass
    return metric

def prometheus_populate_metric(metric, data):
    for name, contains in data.items():
        if contains.get('value'):
            value = contains.get('value')
            metric[name].set(value)
        # doesn't have a value, but has [1-4]:
        if contains.get('values') and isinstance(contains.get('values'), dict):
            for idx, label_value in contains.get('values').items():
                metric[name].labels(idx).set(label_value)
        if contains.get('info'):
            value = contains.get('info')
            metric[name].info({name: value})
        else:
            pass


if __name__ == '__main__':
    try:
        parser = argparse.ArgumentParser(
                    description='Query JBD BMS and report status', 
                    add_help=True,
        )
        parser.add_argument('--json', '-j', dest='report_json', action='store_true', 
                    default=False, help='Report data as JSON')
        parser.add_argument('--prometheus', '-p', dest='report_prometheus', action='store_true',
                    default=False, help='Daemonize and report data to Prometheus')
        parser.add_argument('--textfile', '-t', dest='report_textfile', type=str, action='store',
                    default=False, help='Report data to Prometheus using textfile <file>')
        parser.add_argument('--print', dest='report_print', action='store_true',
                    default=True, help='Report data as text')
        parser.add_argument('--verbose', '-v', action='count',
                    default=0, help='Print more verbose information (can be specified multiple times)')
        args = parser.parse_args()
        debug=args.verbose

        if args.report_prometheus:
            prometheus_export(ser, debug, daemonize=True)
        elif args.report_textfile:
            prometheus_export(ser, debug, daemonize=False, filename=args.report_textfile)
        else:
            main(ser, debug)
    except KeyboardInterrupt:
        cleanup(ser, debug)